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    Quiz: Test Your Anatomy IQ

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    Which nails grows faster?

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    Which nails grows faster?

    • Your Answer:
    • Correct Answer:

    You’re not imagining it. Your fingernails do need a trim more often than your toes. Fingernails typically grow three times faster -- about 3 mm a month -- than toenails (1 mm each month). That's also why your pedicure lasts longer than your manicure.

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    How fast is a sneeze?

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    How fast is a sneeze?

    • Your Answer:
    • Correct Answer:

    Sneezing is your body's way of clearing your nose of annoying things like dust or pepper. Humans can sneeze at a speed of up to 100 miles per hour and cough at up to 50 miles per hour.

    What does your spine do?

    What does your spine do?

    • Your Answer:
    • Correct Answer:

    Your spine has lots of jobs. It holds up your head and upper body. It also lets you twist and bend. The small bones in your spine, called vertebrae, protect your spinal cord. The spinal cord carries nerve signals from your brain to your muscles, telling you to move.

    About how many taste buds are on your tongue?

    About how many taste buds are on your tongue?

    • Your Answer:
    • Correct Answer:

    But some older adults only have about 5,000. The number of taste buds starts decreasing after the age of 60. Salty and sweet tastes are usually the first to go, with bitter and sour lasting longer. Smoking also kills taste buds.

    How much does your hair grow in one year?

    How much does your hair grow in one year?

    • Your Answer:
    • Correct Answer:

    It only seems like it takes forever for a bad cut to grow out. Hair on the scalp grows a little more than 4 inches a year (about 0.3mm per day) on average. Human hair growth – and shedding – is random and not seasonal or cyclical as it is with other mammals

     

    Unlike other mammals, people don't shed their hair seasonally. You lose some hairs every day, and every day new ones are growing in..

    How do your eyes change as you get older? 

    How do your eyes change as you get older? 

    • Your Answer:
    • Correct Answer:

    By age 60, your pupils are about one-third the size they were when you were 20. That can make it take longer for your eyes to adjust to darkness or bright light.

     

    The whites (called sclera) may turn yellowish due to age, but they won't go gray. That happens just with your hair!

    How tiny is your smallest bone?

    How tiny is your smallest bone?

    • Your Answer:
    • Correct Answer:

    That's the stirrup (stapes) bone, which is behind your eardrum. It’s only 2.5 mm to 3.3 mm long. On the other hand, your largest and longest bone is your thigh bone, the femur.

    Where is your smallest muscle?

    Where is your smallest muscle?

    • Your Answer:
    • Correct Answer:

    That's where you find the stapedius muscle, the body's smallest. It helps steady the stapes bone as sound is spread to the inner ear.

    How much of our bodies are water?

    How much of our bodies are water?

    • Your Answer:
    • Correct Answer:

    Overall, we're about 3/5 water. But it depends on the body part. Your brain is 70% water and your lungs are 90% water. Body fat is only 10% water.

    What's your largest organ?

    What's your largest organ?

    • Your Answer:
    • Correct Answer:

    Skin doesn't seem like an organ, but it is. The skin of a 150-pound adult man weighs about 9 pounds. Skin is thinnest on your eyelids and thickest on the soles of your feet.

    How many miles of blood vessels are in your body?

    How many miles of blood vessels are in your body?

    • Your Answer:
    • Correct Answer:

    Blood vessels -- arteries, veins, and capillaries -- are hollow tubes that carry blood throughout your body. If you took them out and laid them end-to-end, you could circle the Earth four times!

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